feat: add UI for build variants list

app/src/main/java/com/itsaky/androidide/actions/sidebar/BuildVariantsSidebarAction.kt

@@ -0,0 +1,42 @@
+/*
+ *  This file is part of AndroidIDE.
+ *
+ *  AndroidIDE is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  AndroidIDE is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.itsaky.androidide.actions.sidebar
+
+import android.content.Context
+import androidx.core.content.ContextCompat
+import androidx.fragment.app.Fragment
+import com.itsaky.androidide.R
+import com.itsaky.androidide.fragments.sidebar.BuildVariantsFragment
+import kotlin.reflect.KClass
+
+/**
+ * Sidebar action for showing the build variants of Android modules in the project.
+ *
+ * @author Akash Yadav
+ */
+class BuildVariantsSidebarAction(context: Context, override val order: Int) :
+  AbstractSidebarAction() {
+
+  override val fragmentClass: KClass<out Fragment> = BuildVariantsFragment::class
+  override val id: String = "ide.editor.sidebar.buildVariants"
+
+  init {
+    label = context.getString(R.string.title_build_variants)
+    icon = ContextCompat.getDrawable(context, R.drawable.ic_android)
+  }
+}

app/src/main/java/com/itsaky/androidide/adapters/BuildVariantsAdapter.kt

@@ -0,0 +1,65 @@
+/*
+ *  This file is part of AndroidIDE.
+ *
+ *  AndroidIDE is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  AndroidIDE is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.itsaky.androidide.adapters
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import android.widget.ArrayAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.itsaky.androidide.R
+import com.itsaky.androidide.databinding.LayoutBuildVariantItemBinding
+import com.itsaky.androidide.tooling.api.models.BuildVariantInfo
+
+/**
+ * [RecyclerView] adapter for showing the list of Android modules and their selected build variant.
+ *
+ * @property items
+ * @author Akash Yadav
+ */
+class BuildVariantsAdapter(
+  private val items: List<BuildVariantInfo>
+) : RecyclerView.Adapter<BuildVariantsAdapter.ViewHolder>() {
+
+
+  class ViewHolder(internal val binding: LayoutBuildVariantItemBinding) :
+    RecyclerView.ViewHolder(binding.root)
+
+  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+    val binding = LayoutBuildVariantItemBinding.inflate(LayoutInflater.from(parent.context), parent,
+      false)
+    return ViewHolder(binding)
+  }
+
+  override fun getItemCount(): Int {
+    return items.size
+  }
+
+  override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+    val binding = holder.binding
+    val variantInfo = items[position]
+
+    binding.moduleName.text = variantInfo.modulePath
+    binding.variantName.setAdapter(
+      ArrayAdapter(binding.root.context, R.layout.support_simple_spinner_dropdown_item,
+        variantInfo.buildVariants
+      )
+    )
+    
+    binding.variantName.listSelection = variantInfo.selectedVariantIndex
+  }
+}

app/src/main/java/com/itsaky/androidide/fragments/RecyclerViewFragment.kt

@@ -22,7 +22,6 @@ import android.view.View
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import androidx.recyclerview.widget.RecyclerView.LayoutManager
-import com.itsaky.androidide.R
 import com.itsaky.androidide.databinding.FragmentRecyclerviewBinding
 
 /**
@@ -47,12 +46,19 @@ abstract class RecyclerViewFragment<A : RecyclerView.Adapter<*>> :
     return LinearLayoutManager(requireContext())
   }
 
-  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-    super.onViewCreated(view, savedInstanceState)
+  /**
+   * Sets up the recycler view in the fragment.
+   */
+  protected open fun onSetupRecyclerView() {
     binding.root.apply {
       layoutManager = onCreateLayoutManager()
       adapter = unsavedAdapter ?: onCreateAdapter()
     }
+  }
+
+  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+    super.onViewCreated(view, savedInstanceState)
+    onSetupRecyclerView()
 
     unsavedAdapter = null
 

app/src/main/java/com/itsaky/androidide/fragments/sidebar/BuildVariantsFragment.kt

@@ -0,0 +1,49 @@
+/*
+ *  This file is part of AndroidIDE.
+ *
+ *  AndroidIDE is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  AndroidIDE is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.itsaky.androidide.fragments.sidebar
+
+import android.os.Bundle
+import android.view.View
+import androidx.fragment.app.viewModels
+import androidx.recyclerview.widget.RecyclerView
+import com.itsaky.androidide.adapters.BuildVariantsAdapter
+import com.itsaky.androidide.fragments.RecyclerViewFragment
+import com.itsaky.androidide.viewmodel.EditorViewModel
+
+/**
+ * A fragment to show the list of Android modules and its build variants.
+ *
+ * @author Akash Yadav
+ */
+class BuildVariantsFragment : RecyclerViewFragment<BuildVariantsAdapter>() {
+
+  private val viewModel by viewModels<EditorViewModel>(ownerProducer = { requireActivity() })
+
+  override fun onCreateAdapter(): RecyclerView.Adapter<*> {
+    return BuildVariantsAdapter(viewModel.buildVariants)
+  }
+
+  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+    super.onViewCreated(view, savedInstanceState)
+    viewModel._buildVariants.observe(viewLifecycleOwner) {
+
+      // Setup the recyclerview each time build variants list is updated
+      onSetupRecyclerView()
+    }
+  }
+}

app/src/main/java/com/itsaky/androidide/utils/EditorSidebarActions.kt

@@ -40,10 +40,12 @@ import com.itsaky.androidide.actions.ActionsRegistry
 import com.itsaky.androidide.actions.FillMenuParams
 import com.itsaky.androidide.actions.SidebarActionItem
 import com.itsaky.androidide.actions.internal.DefaultActionsRegistry
+import com.itsaky.androidide.actions.sidebar.BuildVariantsSidebarAction
 import com.itsaky.androidide.actions.sidebar.CloseProjectSidebarAction
 import com.itsaky.androidide.actions.sidebar.FileTreeSidebarAction
 import com.itsaky.androidide.actions.sidebar.PreferencesSidebarAction
 import com.itsaky.androidide.actions.sidebar.TerminalSidebarAction
+import com.itsaky.androidide.fragments.sidebar.BuildVariantsFragment
 import com.itsaky.androidide.fragments.sidebar.EditorSidebarFragment
 import java.lang.ref.WeakReference
 
@@ -60,7 +62,10 @@ internal object EditorSidebarActions {
   fun registerActions(context: Context) {
     val registry = ActionsRegistry.getInstance()
     var order = -1
+
+    @Suppress("KotlinConstantConditions")
     registry.registerAction(FileTreeSidebarAction(context, ++order))
+    registry.registerAction(BuildVariantsSidebarAction(context, ++order))
     registry.registerAction(TerminalSidebarAction(context, ++order))
     registry.registerAction(PreferencesSidebarAction(context, ++order))
     registry.registerAction(CloseProjectSidebarAction(context, ++order))
@@ -88,6 +93,7 @@ internal object EditorSidebarActions {
     val data = ActionData()
     data.put(Context::class.java, context) // needed for inflating the menu
 
+    val titleRef = WeakReference(binding.title)
     val params = FillMenuParams(data, ActionItem.Location.EDITOR_SIDEBAR,
       rail.menu) { actionsRegistry, action, item, actionsData ->
 
@@ -104,18 +110,15 @@ internal object EditorSidebarActions {
         controller.navigate(action.id, navOptions {
           launchSingleTop = true
           restoreState = true
-
-          popUpTo(controller.graph.findStartDestination().id) {
-            inclusive = false
-            saveState = true
-          }
         })
 
         // Return true only if the destination we've navigated to matches the MenuItem
         val result = controller.currentDestination?.matchDestination(action.id) == true
         if (result) {
           item.isChecked = true
+          titleRef.get()?.text = item.title
         }
+
         result
       } catch (e: IllegalArgumentException) {
         false
@@ -147,36 +150,6 @@ internal object EditorSidebarActions {
         destination(builder)
       }
     }
-
-    val railRef = WeakReference(rail)
-    val titleRef = WeakReference(binding.title)
-    controller.addOnDestinationChangedListener(
-      object : NavController.OnDestinationChangedListener {
-        override fun onDestinationChanged(
-          controller: NavController,
-          destination: NavDestination,
-          arguments: Bundle?
-        ) {
-          val railView = railRef.get()
-          if (railView == null) {
-            controller.removeOnDestinationChangedListener(this)
-            return
-          }
-
-          railView.menu.forEach { item ->
-            if (destination.matchDestination(item.itemId)) {
-              item.isChecked = true
-              titleRef.get()?.text = item.title
-            }
-          }
-        }
-      })
-
-    // make sure the 'File tree' item is checked by default
-    rail.menu.findItem(FileTreeSidebarAction.ID.hashCode())?.also {
-      it.isChecked = true
-      binding.title.text = it.title
-    }
   }
 
   /**
@@ -188,15 +161,6 @@ internal object EditorSidebarActions {
   internal fun NavDestination.matchDestination(route: String): Boolean =
     hierarchy.any { it.route == route }
 
-  /**
-   * Determines whether the given `destId` matches the NavDestination. This handles
-   * both the default case (the destination's id matches the given id) and the nested case where
-   * the given id is a parent/grandparent/etc of the destination.
-   */
-  @JvmStatic
-  internal fun NavDestination.matchDestination(@IdRes destId: Int): Boolean =
-    hierarchy.any { it.id == destId }
-
   @JvmStatic
   internal fun ShapeAppearanceModel.roundedOnRight(cornerSize: Float = 28f): ShapeAppearanceModel {
     return toBuilder().run {

app/src/main/java/com/itsaky/androidide/viewmodel/EditorViewModel.kt

@@ -27,6 +27,7 @@ import com.google.gson.GsonBuilder
 import com.itsaky.androidide.models.OpenedFilesCache
 import com.itsaky.androidide.projects.ProjectManager
 import com.itsaky.androidide.tasks.executeAsync
+import com.itsaky.androidide.tooling.api.models.BuildVariantInfo
 import com.itsaky.androidide.utils.Environment
 import java.io.File
 
@@ -52,6 +53,8 @@ class EditorViewModel : ViewModel() {
    */
   private val mCurrentFile = MutableLiveData<Pair<Int, File?>?>(null)
 
+  internal val _buildVariants = MutableLiveData<List<BuildVariantInfo>>(null)
+
   var openedFilesCache: OpenedFilesCache?
     get() = _openedFiles.value
     set(value) {
@@ -100,6 +103,12 @@ class EditorViewModel : ViewModel() {
       _startDrawerOpened.value = value
     }
 
+  var buildVariants: List<BuildVariantInfo>
+    get() = this._buildVariants.value ?: emptyList()
+    set(value) {
+      this._buildVariants.value = value
+    }
+
   /**
    * Add the given file to the list of opened files.
    *

app/src/main/res/layout/layout_build_variant_item.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~  This file is part of AndroidIDE.
+  ~
+  ~  AndroidIDE is free software: you can redistribute it and/or modify
+  ~  it under the terms of the GNU General Public License as published by
+  ~  the Free Software Foundation, either version 3 of the License, or
+  ~  (at your option) any later version.
+  ~
+  ~  AndroidIDE is distributed in the hope that it will be useful,
+  ~  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~  GNU General Public License for more details.
+  ~
+  ~  You should have received a copy of the GNU General Public License
+  ~   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  xmlns:tools="http://schemas.android.com/tools"
+  android:layout_width="match_parent"
+  android:layout_height="wrap_content">
+
+  <TextView
+    android:id="@+id/module_name"
+    android:layout_width="0dp"
+    android:layout_height="0dp"
+    android:gravity="center_vertical"
+    android:textAppearance="@style/TextAppearance.Material3.BodyLarge"
+    app:layout_constraintBottom_toBottomOf="@id/variant_name_layout"
+    app:layout_constraintEnd_toStartOf="@id/variant_name_layout"
+    app:layout_constraintStart_toStartOf="parent"
+    app:layout_constraintTop_toTopOf="parent"
+    tools:text=":app" />
+
+  <com.google.android.material.textfield.TextInputLayout
+    android:id="@+id/variant_name_layout"
+    style="@style/Widget.Material3.TextInputLayout.OutlinedBox.Dense.ExposedDropdownMenu"
+    android:layout_width="0dp"
+    android:layout_height="wrap_content"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toEndOf="@id/module_name"
+    app:layout_constraintTop_toTopOf="parent"
+    tools:text=":app">
+
+    <AutoCompleteTextView
+      android:id="@+id/variant_name"
+      android:layout_width="match_parent"
+      android:layout_height="match_parent"
+      android:inputType="none" />
+
+  </com.google.android.material.textfield.TextInputLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

resources/src/main/res/values/strings.xml

@@ -594,4 +594,5 @@
   <string name="msg_codeaction_failed">Failed to perform code action</string>
   <string name="idepref_devOptions_enableLogsender_title">Enable LogSender</string>
   <string name="idepref_devOptions_enableLogsender_summary">When disabled, logs from applications won\'t be shown in AndroidIDE</string>
+  <string name="title_build_variants">Build variants</string>
 </resources>

subprojects/tooling-api-model/src/main/java/com/itsaky/androidide/tooling/api/models/BuildVariantInfo.kt

@@ -15,15 +15,15 @@
  *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package com.itsaky.androidide.fragments.sidebar
-
-import com.itsaky.androidide.fragments.EmptyStateFragment
-import com.itsaky.androidide.fragments.RecyclerViewFragment
+package com.itsaky.androidide.tooling.api.models
 
 /**
- * A fragment to show the list of modules and the selected build variants in the
+ * Information about the build variants of an Android module.
  *
+ * @property modulePath The project path of the Android module project.
+ * @property buildVariants The build variants of the Android module project.
+ * @property selectedVariantIndex The index of the build variant in the [buildVariants] list which is currently selected.
  * @author Akash Yadav
  */
-class BulidVariantsFragment  {
-}
+data class BuildVariantInfo(val modulePath: String, val buildVariants: List<String>,
+  val selectedVariantIndex: Int)